I bought these for specific use during my recent trek to the Everest Base Camp. The glasses are nice looking with a good UV protection. But the problem is that the moment you step into high altitude you have to protect your nose & face with a buff against the sun & the wind & that's when the glasses start fogging up within seconds making it difficult to see the track ahead. I had to constantly stop to clean the glasses, even tried wearing them a little loose but got only temporary relief. Further, the edges of the strap have some kind of a design which scratches the skin behind the ear. I had to reverse the strap to get over this problem & then loosen it to prevent the buckle from hitting the head.
Overall an unsuitable product for high altitude trekking.
Very durable and fits very nice (whereas 90% don't fit my face very well). Highly tinted and less transparency. Only thing is that the tint starts to fade away once you use normal clothes (tshirt for instance) to wipe the dirt off. Highly recommended for the price-value!
I've been using them for to short time, but it's one of the better models I've ever used, they've brought me protection against the sun and they're so comfortable, I totally recommend this product, besides, given their quality, they're pretty cheap. God bless you all, keep making sunglasses like these.